592                     check_relations_read_access(cnx, select, args)

   592                     check_relations_read_access(cnx, select, args)

   593             # on select query, always copy the cached rqlst so we don't have to

   593             # on select query, always copy the cached rqlst so we don't have to

   594             # bother modifying it. This is not necessary on write queries since

   594             # bother modifying it. This is not necessary on write queries since

   595             # a new syntax tree is built from them.

   595             # a new syntax tree is built from them.

   596             rqlst = rqlst.copy()

   596             rqlst = rqlst.copy()

   597             self._annotate(rqlst)

   600             self._annotate(rqlst)

   598             if args:

   601             if args:

   599                 # different SQL generated when some argument is None or not (IS

   602                 # different SQL generated when some argument is None or not (IS

   600                 # NULL). This should be considered when computing sql cache key

   603                 # NULL). This should be considered when computing sql cache key

   601                 cachekey += tuple(sorted([k for k, v in args.iteritems()

   604                 cachekey += tuple(sorted([k for k, v in args.iteritems()